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University of Pittsburgh *

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0110

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Chemistry

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Feb 20, 2024

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7

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JauuedSWED YIM pauueds @ section: O\NO __ Date: .Dv_a_"\]_a'_*l__ .A ***To receive credit for lab, your lab instructo =2 gerf* Be sure to include the UNITS of each quantity and the correc el \ 3 gnifican A Part | - The Density of Deionized Water Modeoa Swha : ot l' Name: : Lab Partner: ‘2eq G0u a——— Scientific Measlremapts Temperature of Water Literature Value of Density Data Table SM.1: Data for 2 mL of Water = Trial 1 Trial 2 Trial 3 Initial Buret Reading 0.18 32‘0 qo 4 3 Final Buret Reading | \.QG Ll. y Q (p, E\ \ Volume of Water % A0k 199 Mass of Empty Beaker 2.\133 20.163 20.16%6 Mass of Beaker + Water 223497 22.2334 32.13%5 Mass of Water 014 Resur 19959 Calculate the Density of Water LlI26 pA914 D976R Instructor Signature Laboratory Manual Prepared by Catalyst Education, LLC for University of Pittsburgh SM.1 Page 15 Department of Chemistry.
JauueoSwe) YlIM pauuess Scientific Measurements Data Sheet Data Table SM.2: Data for 20 mL of Water Trial 1 Trial 2 Trial 3 Initial Buret Reading , D.12 46.19 29.9q Final Buret Reading I 40.14 4p. 14 49. Qs Volume of Water , g0.60 an.os 19. 87 s of Eipey Beike: |2607060 201687 3n.17 Mass of Beaker + Water |50.2396 50.6374 434875 Mass of Water |20.0695 19BGTT 19.3164 [o.qcmq ~ D.9909 0.9 78\ Calculate the Density of Water sry Manual Prepared by Catalyst Education, LLC for University of Pittsburgh SM.2 wnt of Chemistry,
JauuedSWED YIM pauueds Part Il - Using a Graduated Cylinder Data Table SM.3: Data Trial 1 Trial 2 Measurements Mass of Dry Graduated Cylinder 1A YeNS N3.7194 Mass of Graduated Cylinder + Water | 4= 42 13 92.5070 Mass of Emptied Graduated Cylinder | 1. 8336 13.64U q4 Literature Density of Water 0.9977% Calculations Mass of Water in Graduated Cylinder 12,9633 19.127% Volume of Water 1(1\1, G)raduated Gitnder. 1 9.7 19.9¢6 Mass of Water out of Graduated Cylinder | 0.02R\ 0.33060 Volume of Water Bt of )Graduated cytinder | 19.53471 194571 x Laboratory Manual Prepared by Catalyst Education, LLC for University of Pittsburgh Department of Chemistry. sM.3 Page’
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JauueoSWeED YlIM pauueds Part Ill - Challenge Use the template below to construct your report for Part II1. You will need to upload these pages to Labflow Y as a pdf. Assigned Unknown Liquid Describe the experimental method(s) you used in your experiment. This description should give a step by step procedure (one that could be understood by a fellow classmate). 1.Wegh emprd Healter and Tewrd OIS reovs Y0 Calcolie &.T\ berex gnd Tecord W0\ TeoRAG g occor ond Yo . C\\\ beolcel‘ w\'\"h %ffll— oc YI%UQ d‘QQmfitfit . Recod Enal burex reoélnj Wegh beaker and Waler Gnd Tecwre 4o .Calcolc+e Volome Qnd masy : 1.0se Calcoeons 4o Rad 39“5‘\%’ Your measured data: Ve HE o e e o G Sfwean LhSa Tewka\ 1304 Fina\ 13044 Tiaalt H0.43 volume.: 1G.47 volome ! 13.93 E 200743 Emp-\a'&o-\-‘—"* Deo itee *daxec +50.3333 Beakes+wiaier | £0.459,\ moss .36 .\841 Mass: 20.8747 Der\swé'. \.0Q%Y Dgr\s‘\*g‘\\ O\ Your calculations: Mass 4\ \Goeceos| MosSS AL |0, ec cot3, S0.3333 \‘ao/j" 504322 130,147 ° s 20 .15 1 Voo, 1.1 [VeiSia ooy (20 |us.u3’ \2ea7dy '_,0;5.1 a.q7 _:_.!9 6.9 b a0 _'q\z\s_\ ooty 1993 =0
lauuedSwe) Ylim pauuedg VULV HIUWSEI SIIISIIIs B wim SISl Based on your results, what can you conclude about the identity of your unknown liquid? Support your answer with your data and calculations. D\\ Weotre ¢ W %6 eccoc Discuss the aspects of accuracy and precision that led to your choice of technique. Acc,ocae% ond pecaision wee \oo¥n Savrisloctery Qe Hs Sechon.Th's led VS Yo beteve I+ 1S O Wated Calculation Check-List Make sure that you have these calculations ready to enter into Labflow. Although you are not asked to submit these pages, it is strongly recommended that you show your work and check your answers with your instructor before leaving class. Part | 2mL Data Calculate the average density of water. 1.029 9/mlL Calculate the percent error of your average density. a7’ Laboratory Manual Prepared by Catalyst Education, LLC for University of Pittsburgh SM.5 Page 19 Department of Chemistry.
Jauueoswe) YlIM pauuess Scientific Measurements Data Sheet Calculate the percent difference for your density data. 3% 20 mL Data Calculate the average density of water. 0.9371C Calculate the percent error of your average density. T % Calculate the percent difference for your density data. A48% MY - Vakisratoms Maniial Diavceat bt vataliab Bdiiacit o S T ey B v el e M Y
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JauueoSWeED YlIM pauueds Part Il Calculate the following: Average V;, Q965 Average V;; 19.496 Percent Error for V;, (Use 20.0 mL for your “true” value and be careful with significant figures!!) 0.1 Yo Percent Error for V,,,, (Use 20.0 mL for your “true” value and be careful with significant figures!!) A5 Laboratory Manual Prepared by Catalyst Education, LLC for University of Pittsburgh Department of Chemistry.